Professor Koichi HISHIDA
Topic: Optical Measurements in Multiphase flows: : Point･Plane･Spatio-temporal, and Furthermore.
The lecture presents mainly a review of measuring techniques for transport process in multiphase flows in past three decades and an outlook of future progress on distributed measuring systems. Laser based measuring system had started by point measurement such as a probe, laser Doppler, and Phase Doppler anemometry, and then extended to Particle Imaging techniques to obtain 2D plane information. Recently, high speed digital cameras allowed us to get 3D3C temporal velocity information and its pressure evaluation. In addition, the possibility of IoT based distributed sensing/imaging system is discussed with an application of multiphase flow analysis for future developments.
Keywords: Flow Measurements, Optical System. Laser Techniques, Particle Image velocimetry, Tomographic PIV. Internet of Things (IoT)
Professor, Meiji University
Professor Emeritus, Keio University
Member of Science Council of Japan
Professor Timothy S. Fisher
Topic: Practice Your Scales! Nanomaterials for Fast Energy Processes
The basic theories of energy and charge transport are a century old, yet classical and quantum size effects have been exploited usefully in practical materials only for the past two decades, and often with a modest level of success in practice. Many of the remaining challenges involve problems of time and length scales - e.g., faster energy transport processes enabled by new materials that can be manufactured economically at human scales. Success in the large-scale adoption of nanomaterials, with their prevalence of interfaces, will likely depend on deeper fundamental understanding of both interfacial transport in assemblies of nanomaterials over wider time scales and high-throughput manufacturing processes over larger length scales in order to tune their performance and engineer them for desired properties in real applications. For example, individual carbon nanotubes possess extremely high axial thermal conductivity, yet when placed in a composite matrix, the effective thermal properties are quite ordinary. For high-performance cooling applications, single-phase convection is a limited option because of its inability to dissipate ultra-high thermal loads, thus constraining the performance of the host system. With these challenges in mind, this presentation will consider how nanomaterials can be exploited at appropriate engineering scales to improve the performance of practical thermal and energy storage technologies, particularly those requiring rapid transient response. Carbon nanomaterials for use in fast-charging and discharging electrochemical energy storage devices offer particular promise as scalable, high-performance electrodes, and similar structures show outstanding sensitivity to biological analytes. Moreover, the microstructure of granular assemblies of battery cathode materials will be shown to have a profound effect on charge/discharge speed. As another example, a tunable cooling technology befitting fast transient thermal events will be described. In this system, the rapid depressurization of the working fluid triggers coincident flash boiling and desorption events, thereby achieving very high cooling rates for short periods of time. We anticipate that this technology, when properly controlled, will achieve instantaneous peak cooling efficiencies surpassing those other advanced cooling systems. The presentation will close with a discussion of opportunities to enable cost-effective, large-scale production of these technologies.
Professor and Department Head of Mechanical and Aerospace Engineering.
University of California
Professor Kyung Chun Kim
Topic: Momentum and heat transport through stochastic porous media
Random nature of stochastic foam provides large specific surface area and high porosity. Using micro-tomography and stereo-lithography, a transparent stochastic foam was printed out. Quantitative flow visualization was performed using refractive index matching technique and time-resolved particle image velocimetry. Mechanical mixing in the stochastic foam is beneficial, but large wake area behind the struts cause high pressure drop. On the basis of the results, a new concept of structure generated turbulence due to complex geometry is proposed. High porosity metal foam can improve thermal performance of heat exchangers, especially in two-phase flows. Flow boiling in metal foam inserted channel is experimentally investigated. Boiling heat transfer coefficient and pressure drop properties across different types of metallic foam structure are discussed with the effects of the inlet vapor quality and the heat flux. The results in this talk help to understand the flow boiling heat transfer mechanism through the stochastic porous media.
PNU Distinguished (Seok Hak) Professor
Director, Experimental Thermo-Fluids Mechanics and Energy Systems (ExTENsys) Laboratory
Professor, School of Mechanical Engineering
Pusan National University
Program at a glance
|Technical Sessions||Technical Sessions|
|Lunch||Lunch on your own||Lunch on your own|
|PM||Technical Sessions||Technical Sessions|
Tuesday, October 13
Wednesday, October 14
|AM||Opening Plenary Lectures|
|Lunch||Lunch on your own|
Thursday, October 15
|Lunch||Lunch on your own|
Friday, October 16